This is not to say a gym membership is always a bad idea. But if you buy one thinking that the cost will guilt you into going, think again. And if you buy one and never go after the first few times, then cancel the contract, rather than draw it out for months or years of small charges.
But let's face it - the numbers don't lie. 6500 members and room for 300 at a time. Even assuming people stagger their attendance, at least half, if not far more, of those who are signing up are never going to the gym.